Should I see a doctor?

Hey guys. So sat i got into a car accident. My neck was fine then, it started to hurt a little before i went to bed but not much. I work up Sunday and it was pretty sore so i figured it was whiplash. It was a little sore today but seemed like it got better until now! It feels like there is a bruise on it, it also feels like one of those heat packs is constantly on it. So my question is should i go see a doctor tomorrow or do you think its just whiplash still?